Locking device for hand-drills.



G. L. WILGOX. LOCKING DEVICE FOR HAND DRILLS.

APPLICATION FILED JUNE 24, 1913.

Patented Jan. 6, 1914.

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GEORGE L. VJ'ILCOX, OF NEW YORK, N. Y.

LOCKING DEVICE FOR HAND-DRILLS.

Specification of Letters Patent.

Patented J an. 6,1914.

Application filed June 24, 1913. Serial No. 775,454.

To all whom it may concern:

Be it known that I, GEORGE L. WILOOX, a citizen of the United States, and a resident of the city of New York, borough of Manhattan, in the county and State of New York, have invented a new and Improved Locking Device for Hand-Drills, of which the following is a full, clear, and exact description.

The object of the device is to provide a new and improved locking device for hand drills more especially designed to enable the user of the drill to readily and quickly manipulate the drill chuck for the insertion, fastening or removal of the boring or drilling tool.

In order to accomplish the desired result use is made of a spring-locking member adapted to engage the drill-actuating mechanism to lock the latter temporarily against movement, the resiliency of the said springlocking member holding the latter normally out of engagement with the said actuating mechanism.

A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a side elevation of the locking device as applied, parts being shown in section; Fig. 2 is a face view of the same; Fig. 3 is an inverted sectional plan view of the same on the line 3-3 of Fig. 2; Fig. 4: is a face view of the spring-locking member; and Fig. 5 is a side elevation of the locking device as applied to another form of hand drill.

The hand drill shown in Figs. 1 and 2, and to which the locking device is applied, consists of the usual stock A provided with an end handle B and a side handle G screwed onto a stud D attached to or forming part of the stock A. In the stock A is journaled the drill spindle E carrying a chuck F of the usual construction, and arranged for holding the drilling tool or boring tool G. On the spindle E is secured a bevel pinion H in mesh with a bevel driving gear wheel I mounted to turn on the stock A and provided with a crank arm J under the control of the operator for turning the gear wheel I with a view to rotate the pinion H, the spindle E, chuck F and the tool Gr.

It is understood that the hand drill so far described is of the standard type of drill now generally in use. A locking tooth K is adapted to pass between adjacent teeth of the pinion H to lock the latter against rotation while the operator manipulates the chuck F for inserting, fastening or removing the tool G. The tooth K is struck up or is secured or otherwise formed on the free end K of a flat spring K secured in position on the stock A by the handle C, the said spring K having for this purpose an aperture K engaging the stud D, so that when the handle G is screwed up the spring K is clamped in place on the stock A. The free end K of the spring K is preferably segmental so as to form a guard over the peripheral face of the pinion H, the side edges of the guard slidingly engaging the side bars A of the stock A. The spring K is so arranged that the tool K is normally out of engagement with the pinion H to allow free rotation of the spindle E on the operator turning the handle J, as previously eX- plained. When it is desired to manipulate the chuck F, however, for the insertion, fastening or removal of the tool G, then the operator having hold of the handle C presses the free end K of the spring K inward so that the tooth K passes between adjacent teeth of the bevel pinion H whereby the latter is locked against rotation to allow the operator to readily turn the sleeve of the chuck F for opening or closing the toolholding jaws, as the case may be. When this has been done the operator releases the spring K so that the latter by its own resiliency swings outward and in doing so moves the tooth K out of engagement with the pinion H to unlock the latter and allow the same to rotate.

In the modified form shown in Fig. 5 use is made of two pinions H and H, of which the pinion H is an idler and journaled on the stock A adjacent the end handle B. In this case the spring K extends from the handle C toward the handle B, and its free end K forms a guard over the idler pinion H, and the tooth K is adapted to engage adjacent teeth of this pinion H whenever the operator presses the spring K inward, it being understood that in this case it is convenient for the operator to have hold of the handle B and to press the free end K of the spring K with his thumb.

It is understood that I do not limit myself to any particular make of hand drill,

shown and described as applied to a hand drill it is evident that the device may be applied to small power drills for the same purpose.

Having thus described my invention, I

claim as new and desire to secure by Letters Patent:

1. In a drill, the combination with the drill stock and drill-actuating mechanism having gear wheels, of a locking member, and a spring carrying the said locking member, the said spring being attached to the said drill stock and the said locking member being in juxtaposition relative to the peripheral face of one of the said gear wheels to engage the said gear wheel at any one point to lock the said drill actuating mechanism on pressing the spring, the latter on being released moving the locking member out of locking engagement with the said gear wheel and holding it normally in an inactive position.

2. A drill provided with a fiat spring secured at one end to the drill stock and pro vided at its free end with a segmental guard extending over the peripheral face of one of the gear wheels of the hand drill, and a tooth on the under side of the said guard and adapted to pass between adjacent teeth of the said gear wheel on pressing the said guard, the said spring normally holding the said tooth out of engagement with the said gear wheel.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE L. lVILCOX.

Witnesses:

Tnno. G. Hoscrnn, PHILIP D. RoLLHAUs.

7 Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Baton, l;

Washington, D. C. 

